Polypropylene modified

Figure 11.11 Presumed structure of polyethylene and polypropylene modified with...

Mica, because of its platelet structure is a very useful filler. Its performance is improved by increasing the compatibility between filler and polymer. Silane modification is one simple and frequently used method. An alternative method involves a polymeric modifier which, in the case of polypropylene formulations, is polypropylene modified by maleic anhydride. Such modifiers act more as compatibilizers. They are added in small amounts to a system containing both mica... 

NMR spectroscopy has been applied to investigate the behavior under uniaxially mechanical deformation. A study of drawn fibers prepared from an isotactic polypropylene modified by an ethylene-aminoalkyl acrylate copo-l)uner has been done using the broad line of H NMR. NMR spectra were measured on the set of fibers prepared with a draw ratio X from q to 5.5 at two temperatures, one of them corresponding to the onset of segmental motion and the other one is the middle of the temperature interval as determined by decrease of the second moment 2D time-domain H NMR was used to... 

The crystallization behavior of polypropylene modified epoxy resin was studied extensively. The crystallization of polypropylene was influenced by the addition of epoxy resin. The first cooling and second heating DSC thermograms of polypropylene, polypropylene/epoxy, polypropylene/MAH-g-PP, polypropylene/MAH-g-PP/epoxy, and dynamically cured polypropylene/epoxy blends are shown in Figs. 21.4 and 21.5 and the data obtained from DSC studies are summarized in Table 21.4 (48). 

It has also been reported that polypropylene modified with nanosized silicon oxide can distinctively improve the processability of polypropylene while simultaneously increasing its strength. On the basis of the four property indices, specific electrical resistance, water absorption, flex stiffness, and rigidity, the modified fiber has reached or surpassed the indices of polyamide 6. 

Processes of ethene/a-olefin copolymerization are of great practical importance. Copolymerization of ethene with small amounts of highest a-olefins (1-butene, 1 -hexene, 1 -octene) allows one to produce linear low density polyethylene (LLDPE), which is one of the most widely used large-scale polyolefin products. Polypropylene, modified with small amounts of ethene, exhibits higher impact strength compared to isotactic homopolypropylene. Copolymerization of propene with large amounts of ethene and terpolymerization of ethene/propene/diene result in amorphous elastomer materials (rubbers) [103]. 

Shibryaeva LS., Shatalova O.V., Solovova J.V. and al. (2010). "Features of thermal oxidation of polypropylene modified with paraffin cal." Theoretical osnovy himicheskoy technologii. V.44. No 4. P. 454-466. 

Novak, I. Florian, S. (2001). Influence of aging on adhesive properties polypropylene modified by discharge plasma. Polym. Intern., Vol. 50, pp. 49-52, ISSN 0959-8103. 

Novak, I. Florian, S. (1995). Adhesive properties of polypropylene modified by electric discharge. /. Mater. Sci. Lett, Vol. 14, pp. 1021-1022, ISSN 0261-8028. 

Novak, I. (1996). Surface properties of polypropylene modified by chromo suphuiic add. /. 

Fas Fasce, L. A., Frontini, P. M., Wong, S.-C., Mai, Y.-W. Polypropylene modified with elastomeric metallocene-catalyzed polyolefin blends Fracture behavior and development of damage mechanisms. J. Polym. Sci. Part B - Polym. Phys. 42 (2004) 1075-1089. 

Kim, C. M., Michler, C. H., Cahleitner, M., and MiUhaupt, R. 1998. Influence of morphology on the toughening mechanisms of polypropylene modified with coie-sheU particles derived from thermoplastic elastomers. Polymer Advance Technology 9 709-715. 

Kotek,). et al. (2004) Tensile behavior of isotactic polypropylene modified by specific nucleation and active fibers. Ear. Polym. ]., 40, 679. 

Zaharescu, T., Jipa, S., Supaphol, P. Thtamal stability of isotactic polypropylene modified with CaCOa nanoparticles. Polym. Bull. 64, 783-790 (2010)... 

S. Cimmino, D. Duraccio, C. Silvestre, M. Pezzuto, Isotactic polypropylene modified with clay and hydrocarbon resin compatibility, structure and morphology in dependence on crystallization conditions. Applied Surface Science 256 (3 Suppl.) (2009) S40-S45. 

Fig. 12 Chemiluminescence curves recorded for polypropylene modified with capsaicin, metallic selenium and capsaicin/metallic selenium couple. Additive concentration 0.25 % w/w testing temperature 190 °C ...

Yukun Wei, Haojiang Wang, Chun Pang et al. Study on properties of polypropylene modified by whiskers. Synthetic Materials Aging and Application, 35(1) 12-16, 2006. 

Water absorption of thermoplastic resins is lowered with glass reinforcements as indicated in Table 3-1. Exceptionally low water absorption is found in glass-reinforced (GR) fluoropolymers, PVC, polyethylene, polypropylene, modified polyphenylene oxide, polyphenylene sulfide, polycarbonates, and polyesters. The poorest systems are the nylons 6, 6/6, 6/10 and acetals. Other nylons such as nylons 11,12, and 6/12 are comparable to... 

Nov k I, Flori n S. Influence of ageing on adhesive properties of polypropylene modified by discharge plasma. Polym Int 2001 50 49-52. 

Because the chemiluminescence method is a tool frequently used to qualify the stabilizing effect in polypropylene of various hindered amine, the analysis of CL kinetic parameters (oxidation induction time, oxidation rate, activation energy of oxidation, CL intensity) could provide reliable information related to the photodegradation state of polypropylene modified with different HALS compounds [76-78]. 

The dominant materials in flexible fascia are thermoplastic olefins, TPO (polypropylene modified with, typically, ethylene-propylene-diamine monomer [EPDM]), followed by polyurea (Fig. 6). Because of consumer preference for high surface quahty, most fascia are fuUy or partially painted with body-matching coatings. Unpainted fascia having molded-in-color are prepared fi om both TPO and ionomers of polyethylene. 

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